Why Gluten Is the Backbone of Every Great Sourdough Loaf (And How to Actually Build It)

⏱ 7 min read

Spring is a genuinely good time to geek out on sourdough. The kitchen is warming up, fermentation is livelier, and after a few months of wrestling with sluggish winter doughs, it feels like the whole process has a bit more energy to it. If you have been baking through the colder months, you will start noticing your dough behaving differently over the next few weeks , and a big part of that comes down to one thing: gluten.

Gluten gets talked about a lot in baking circles, usually either as a magic word or a villain, depending on who you ask. But for sourdough bakers, understanding what gluten actually is and how it works is one of those things that quietly transforms your results. Once it clicks, you start reading your dough differently , and that changes everything.

So What Actually Is Gluten?

Gluten is not an ingredient you add. It is a protein network that forms when two proteins naturally present in wheat flour , glutenin and gliadin , come into contact with water and are worked together. On their own, neither does much. But once hydrated and agitated, they bond together into long, elastic chains: that is gluten.

Think of it like mixing two components that are inert separately but reactive together. A bit like debugging code, honestly , the individual parts look fine in isolation, but the behaviour only emerges when you combine them under the right conditions.

What gluten gives you is structure and elasticity. Structure to hold the shape of your loaf. Elasticity to trap the carbon dioxide gases produced by fermentation, so your dough rises rather than just... spreading flat on your worktop.

How Gluten Develops in Sourdough

There are a few ways gluten develops, and sourdough actually leans on all of them.

Hydration: Water is what gets the whole process started. When flour absorbs water, the glutenin and gliadin proteins hydrate and become mobile enough to start bonding. This is part of why the autolyse step is so effective , giving flour and water time to sit together before you add anything else lets gluten formation get a head start, passively, without any effort from you.

Mechanical work: Kneading, folding, and stretching physically aligns the protein chains and encourages them to bond. In sourdough, we tend not to knead heavily the way you would with a commercial yeast dough. Instead, we use stretch and folds during bulk fermentation. This gentler approach still builds a strong network but preserves the texture and extensibility of the dough.

Time: This is where sourdough is genuinely interesting. Fermentation itself contributes to gluten development. The organic acids produced by your starter (lactic and acetic acid) condition the dough over time, and the slow, long bulk ferment allows the gluten network to organise itself in a way that fast yeasted doughs simply cannot replicate. The flavour and the structure develop together.

Extensibility vs Elasticity: The Balance That Matters

Gluten has two qualities that pull in opposite directions, and good sourdough baking is about keeping them in balance.

Elasticity is the dough's tendency to spring back when you stretch it. Strong elasticity means the dough holds its shape and resists being pulled apart. That is what keeps your loaf upright during proofing.

Extensibility is the dough's ability to stretch without tearing. A dough that is all elasticity and no extensibility is tight, resistant, and will tear rather than expand in the oven. You need extensibility to allow the dough to open up properly during baking.

A freshly mixed dough is often quite tight and elastic. As fermentation progresses, the acids produced by your starter actually relax the gluten slightly, improving extensibility. This is part of why properly fermented sourdough dough feels silky and cooperative by the end of bulk , compared to a stiff, springy mess at the start.

This is also why overfermented dough becomes a problem. Leave it too long, and those acids break down the gluten too far. The dough goes slack, loses structure, and will spread rather than rise in the oven. It is a fine balance, and reading the dough is a skill that takes a bit of time to develop.

Flour Choice and What It Does to Your Gluten

Not all flours build the same gluten network, and this matters quite a bit in spring when you might be experimenting with new flours or recipes.

Strong white bread flour, typically milled from hard wheat varieties with 12 to 14 percent protein content, produces a robust, elastic gluten network. It is the workhorse of sourdough baking and handles high hydration well.

Wholemeal and wholewheat flours contain the bran and germ of the wheat, which have sharp edges that can physically cut through gluten strands as they develop. This is why 100 percent wholemeal loaves are denser , the gluten network gets interrupted. Blending wholemeal with strong white flour (a 20 to 30 percent wholemeal blend is a great starting point) gives you flavour and nutrition without sacrificing too much structure.

Rye flour is fascinating but behaves differently again. It contains very little gluten-forming protein and instead relies on pentosans (a type of carbohydrate) to create its structure. A small amount of rye in your blend , say 10 percent , adds flavour and actually gives your starter a boost, but lean too heavily on it and you will lose the classic sourdough structure entirely.

If you are working on getting all of this to click together, and you want someone to help you actually read your dough rather than just follow a recipe, that is exactly what The Dough Coach is for. It is a digital coaching product designed to help home bakers understand what is happening at each stage, so you can troubleshoot in the moment rather than wondering what went wrong after the fact.

How to Know Your Gluten Is Well Developed

There is a classic test called the windowpane test. Take a small piece of dough, gently stretch it between your fingers into a thin sheet. If it stretches thin enough to be almost translucent without tearing, your gluten is well developed. If it tears immediately, it needs more work or more time.

The feel of the dough also tells you a lot. A well-developed dough feels smooth, slightly tacky but not sticky, and holds its shape when you round it on the bench. It will have a bit of bounce when you press it. Early in the bulk, the dough will feel shaggy and loose. By the end, it should feel cohesive and alive.

With spring temperatures coming in and fermentation speeding up naturally, it is worth keeping an eye on timing. What took eight hours in January might take five or six hours by April. The gluten development and fermentation are always running in parallel, and warmer temperatures accelerate both.

Happy baking! Find everything you need at doughrise.store

Photo by Stephen Han on Unsplash